The only difference is in where the view is added:  whether it is the frontmost view (`addSubview:`), or it is before the 5th subview, (`insertSubview:atIndex:`) or if it is immediately behind another subview (`insertSubview:aboveSubview:`).

Using `insertSubView:` you can specify the index, which determines z-order of views. A view with a higher index lies above those with lower indices.

I don&#39;t think there is a difference. `addSubview:` is simple a convenient method for

    [view insertSubview:aView atIndex:[view.subviews count]]

1.addSubview  add subview in array then add in View&#39;slayer

    - (void)addSubview:(UIView *)subview
    {
        [_subviews addObject:subview];
        [_layer addSublayer:subview.layer];
    }
}
 


2.While insertSubview add your view as subview then call 
`[_layer insertSublayer:subview.layer atIndex:index];`

    - (void)insertSubview:(UIView *)subview atIndex:(NSInteger)index
    {
      [self addSubview:subview];
      [_layer insertSublayer:subview.layer atIndex:index];
    }

Is there a built-in function that would convert a color by name into its hex representation?
Like I want to pass &#39;white&#39; and receive &#39;#FFFFFF&#39;. I really want to avoid coding all hundred if&#39;s myself :)



Javascript function to convert color names to hex codes



I am getting an empty array of product identifiers from `SKProductsRequest`.

I did the following steps:

1. Created a In App Purchase Test User account under &#39;Manage Users&#39; in iTunes Connect

2. Created some in app purchase products under &#39;Manage Your In App Purchases&#39;. 

3. Loaded the app onto the iPhone, went to Settings → Store and logged out of the regular store

4. Set a breakpoint in the `(void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response` callback

All the submitted Product ID&#39;s are in the response&#39;s `invalidProductIdentifiers` property. When submitting the request I tried both the Product IDs created during step 2 as well as those IDs prefixed with the Bundle ID.

Thanks in advance,

Raghu

StoreKit In App Purchase invalid product identifiers

What is the difference between `addSubview` and `insertSubView` methods when a view is added programmatically?

Difference between addSubview and insertSubview in UIView class

<p>What is the difference between <code>addSubview</code> and <code>insertSubView</code> methods when a view is added programmatically?</p>


I&#39;m in the processes of internationalizing an iPhone app - I need to make programmatic changes to certain views based on what the user&#39;s current locale is.  I&#39;m going nuts because no matter what the language preference on the iPhone simulator or actual hardware are, ``locale`` always evaluates to &quot;en_US&quot;:

    NSString *locale = [[NSLocale currentLocale] localeIdentifier];
    NSLog(@&quot;current locale: %@&quot;, locale);

The crazy thing is that the rest of the application behaves as expected.  The correct strings are selected from the Localization.strings file and used in the interface, and the correct .xib files for the selected locale are used.

I have also tried the following, to no avail and with the same result:

    NSString *locale = [[NSLocale autoupdatingCurrentLocale] localeIdentifier];
    NSLog(@&quot;current locale: %@&quot;, locale);

Is there something simple I&#39;m missing?  A preference or an import perhaps?

**What I used to do:**

As Darren&#39;s answer suggests, the preference I&#39;m looking for is not in `NSLocale`, rather it is here:

    NSUserDefaults* userDefaults = [NSUserDefaults standardUserDefaults];
    NSArray* languages = [userDefaults objectForKey:@&quot;AppleLanguages&quot;];
    NSString* preferredLanguage = [languages objectAtIndex:0];
    NSLog(@&quot;preferredLanguage: %@&quot;, preferredLang);

**Peter&#39;s answer seems to be a better solution:**

    NSArray* preferredLanguages = [NSLocale preferredLanguages];
    NSLog(@&quot;preferredLanguages: %@&quot;, preferredLanguages);

NSLocale currentLocale always returns &quot;en_US&quot; not user&#39;s current language

How to calculate the MD5 in Objective-C?




MD5 algorithm in Objective-C

I want to insert a `UIImage`s inside the compose sheet of an `MFMailComposerViewController`. 

Please note I don&#39;t want to attach them, but I want to place them in a table using HTML code which will be the part of the email body.

How to add a UIImage in MailComposer Sheet of MFMailComposeViewController

Hey I am using a NSURL Connection to receive data. 

    [NSURLConnection sendSynchronousRequest:
	//create request from url
	[NSURLRequest requestWithURL:
	  //create url from string
	  [NSURL URLWithString:url]
	] 
	//request parameters
	returningResponse:nil error:nil
    ] 

Is it possible to change the user agent string?
right now it is:

AppName/AppVersion CFNetwork/459 Darwin/10.0.0.d3

Changing the userAgent of NSURLConnection

I&#39;m looking for a way to determine if the user has, via settings, enabled or disabled their push notifications for my application.


Determine on iPhone if user has enabled push notifications

is it possible to determine whether my `UIView` is visible to the user or not?

My View is added as `subview` several times into a `Tab Bar Controller`.

Each instance of this view has a `NSTimer` that updates the view.

However I don&#39;t want to update a view which is not visible to the user.

Is this possible?

Thanks

Determine if UIView is visible to the user?

I want to make a UIView or UIImageView that is a circle. Or a circle that i can change the size of using a slider, and the color of with a pickerview.

How to make a circular UIView

I want to alter the `anchorPoint`, but keep the view in the same place.
I&#39;ve tried `NSLog`-ing `self.layer.position` and `self.center` and they both stay the same regardless of changes to the anchorPoint. Yet my view moves!

Any tips on how to do this?

		
    self.layer.anchorPoint = CGPointMake(0.5, 0.5);
    NSLog(@&quot;center point: %f %f&quot;, self.layer.position.x, self.layer.position.y);
    self.layer.anchorPoint = CGPointMake(1, 1);
    NSLog(@&quot;center point: %f %f&quot;, self.layer.position.x, self.layer.position.y);
    			
The output is:

    2009-12-27 20:43:24.161 Type[11289:207] center point: 272.500000 242.500000
    2009-12-27 20:43:24.162 Type[11289:207] center point: 272.500000 242.500000

Changing my CALayer&#39;s anchorPoint moves the view

I have an app with with a `UITabController` and each tab is a `UINavigationController`. The root of one of my `UINavigationControllers` is a `UIViewController`.

Inside that view controller&#39;s view, I want to layout some subviews, but I&#39;m confused as to where &amp; how to lay them out in a way that will be resolution independent (i.e. not hardcode values such as 320px, 480px, 44px, etc.).

When the view is fully loaded and presented on a vertical iPhone, it&#39;s height will be 367px = 480 - 20 (status bar) - 44 (nav bar) - 49 (tab bar).

Inside the view controller, I currently create all my subviews within the `viewDidLoad` method. However, it appears that within this method, the view&#39;s current height is 460px (`self.view.bounds.size.height`). So when setting up my subviews, I cannot properly calculate the sizes of anything.

Within the `viewWillAppear:` method, the view **does** know it&#39;s proper size, but that would mean setting &amp; calculating the subview&#39;s frames every time the view will appear (e.g. tab changes or popping from child view controllers on the navigation stack.

Is the only way to do this properly to layout in `viewWillAppear:`?

I have tried using the autoresizing properties (parent&#39;s `autoresizesSubviews` &amp; `autoresizingMask`) but they don&#39;t seem to work at all!? Do these only take effect once the view is all setup and then it is resized (manually / orientation change?).

I&#39;d be grateful if someone could let me know why the autoresizing isn&#39;t working, and how best to lay things out by not hardcoding any sizes.

Laying out &amp; sizing of subviews in a UIViewController

I am wondering how my iPhone app can take a screen shot of a specific `UIView` as a `UIImage`.

I tried this code but all I get is a blank image.

    UIGraphicsBeginImageContext(CGSizeMake(320,480));
    CGContextRef context = UIGraphicsGetCurrentContext();
    [myUIView.layer drawInContext:context];
    UIImage *screenShot = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

&lt;code&gt;myUIView&lt;/code&gt; has dimensions 320x480 an it has some sub-views.
What is the correct way to do this?


How Do I Take a Screen Shot of a UIView?

I&#39;m looking to create my own custom Sort By Date and Sort By Number buttons that I plan on placing in the navigation bar as the right button.

How big should my image be to appropriately fill the space -- the [UIBarItem][1] documentation page doesn&#39;t list anything about the size the image should be.


  [1]: https://developer.apple.com/documentation/uikit/uibaritem

How big should a UIBarButtonItem image be?

How can I programmatically select all text in UITextField?


Programmatically Select all text in UITextField

I&#39;m struggling to find a good solution to this problem. In a view controller&#39;s `-viewWillDisappear:` method, I need to find a way to determine whether it is because a view controller is being pushed onto the navigation controller&#39;s stack, or whether it is because the view controller is disappearing because it has been popped.

At the moment I&#39;m setting flags such as `isShowingChildViewController` but it&#39;s getting fairly complicated. The only way I think I can detect it is in the `-dealloc` method.

viewWillDisappear: Determine whether view controller is being popped or is showing a sub-view controller

I have really great wish to set my own color to UITextField border. But so far I could find out how to change the border line style only.

I&#39;ve used background property to set background color in such way:

    self.textField.backgroundColor = textFieldColor;

But I have to change color of UITextField border too. And my question was about how to change the border color.


UITextField border color

I want to add an image to a UIButton, and also want to scale my image to fit with the UIButton (make image smaller). Please show me how to do it.

This is what I have tried, but it does&#39;t work:

 - Adding image to button and using `setContentMode`:

&lt;!-- --&gt;

    [self.itemImageButton setImage:stretchImage forState:UIControlStateNormal];
    [self.itemImageButton setContentMode:UIViewContentModeScaleAspectFit];


 - Making a &quot;stretch image&quot;:

&lt;!-- --&gt;

    UIImage *stretchImage = [updatedItem.thumbnail stretchableImageWithLeftCapWidth:0 topCapHeight:0];

scale Image in an UIButton to AspectFit?

When my app gets back to its root view controller, in the `viewDidAppear:` method I need to remove all subviews.

How can I do this?

How to remove all subviews?

I created `UIImageView` with the help of Interface Bulder. Now I want to place label inside it (as its subview). In code I can type something like: `[myUIImageView addSubview:myUILabel];` But can I do it with the help of IB? I found the solution for `UIView`, but can&#39;t find something similar for `UIImageView`.

Apple Interface Builder: adding subview to UIImageView

How can I loop through all subviews of a UIView, and their subviews and their subviews?

How can I loop through all subviews of a UIView, and their subviews and their subviews

I want to list out all the subviews in a `UIViewController`. I tried `self.view.subviews`, but not all of the subviews are listed out, for instance, the subviews in the `UITableViewCell` are not found. Any idea?

How to list out all the subviews in a uiviewcontroller in iOS?

I am not sure what are the benefits of using `&lt;f:view&gt;` and `&lt;f:subview&gt;`.
I noticed that one could write JSF pages without using them.

What are the benefits of using those tags?



When to use f:view and f:subview

I&#39;ve created a view in a xib (with an activity indicator, a progress view and a label).
Then I&#39;ve created .h/.m files:

    #import &lt;UIKit/UIKit.h&gt;

    @interface MyCustomView : UIView {
        IBOutlet UIActivityIndicatorView *actIndicator;
        IBOutlet UIProgressView *progressBar;
        IBOutlet UILabel *statusMsg;
    }

    @end

    #import &quot;MyCustomView.h&quot;
      
    @implementation MyCustomView    

    - (id)initWithFrame:(CGRect)frame {
        if ((self = [super initWithFrame:frame])) {
            // Initialization code
        }
        return self;
    }

    - (void)dealloc {
        [super dealloc];
    }

    @end


**In IB, I set the file&#39;s owner and view identity to MyCustomView and connect the IBOutlet to the File&#39;s owner**

In MyViewController.m, I&#39;ve:

    - (void)viewDidLoad {

        [super viewDidLoad];   

        UIView *subView = [[MyCustomView alloc] initWithFrame:myTableView.frame];
        [subView setBackgroundColor:[UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.5]];

        [myTableView addSubview:subView];
        [subView release];
    }

When I run the app, the view is added, but I can&#39;t see the label, the progress bar and the activity indicator. 

What am I doing wrong?

Content Type	Original Author	Original Content on Stackoverflow
Question	Ashwani K	View Question on Stackoverflow
Solution 1 - Iphone	mahboudz	View Answer on Stackoverflow
Solution 2 - Iphone	Nikolai Ruhe	View Answer on Stackoverflow
Solution 3 - Iphone	sliver	View Answer on Stackoverflow
Solution 4 - Iphone	user2369870	View Answer on Stackoverflow

Difference between addSubview and insertSubview in UIView class

Iphone Problem Overview

Iphone Solutions

Solution 1 - Iphone

Solution 2 - Iphone

Solution 3 - Iphone

Solution 4 - Iphone

StoreKit In App Purchase invalid product identifiers

Javascript function to convert color names to hex codes

Attributions